If Nicolás Maduro is removed from office in Venezuela, Putin might act as he did when a popular revolution overthrew Yanukovych in Ukraine in 2014. At that time, he launched a surprise invasion of Crimea. This time, he may launch a surprise naval and land attack on Mariupol, set up a land bridge from Crimea to Russia, and continue intensifying his attempt to strangle Ukraine's economy in order to subjugate that country to Russia. Trump must take immediate preemptive measures to prevent this by increasing naval aid to Kiev.